This stock is a very good buy it has helped me much more then using my co2 tank to aim its a bit pricy though but its made of a really strong plastic so it will last for a long time so its worth it in the end it can be adjusted to 6 different lengths by just pressing a knob on the bottom and pulling it back or forward

Conclusion:

Buy it it will help u out a lot i recommend buying a remote coil along with it though